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TC7116 データシート(PDF) 13 Page - Microchip Technology

部品番号 TC7116
部品情報  3-1/2 Digit Analog-to-Digital Converters with Hold
PDF  24 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7116 データシート(HTML) 13 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21457C-page 13
TC7116/A/TC7117/A
5.0
TC7117/TC7117A POWER
SUPPLIES
The TC7117/TC7117A are designed to operate from
±5V supplies. However, if a negative supply is not avail-
able, it can be generated with a TC7660 DC-to-DC con-
verter and two capacitors. Figure 5-1 shows this
application.
In selected applications, a negative supply is not
required. The conditions for using a single +5V supply
are:
1.
The input signal can be referenced to the center
of the Common mode range of the converter.
2.
The signal is less than ±1.5V.
3.
An external reference is used.
FIGURE 5-1:
Negative Power Supply
Generation with TC7660
VREF+
V+
TC7117
TC7117A
36
10
μF
VIN+
VIN-
COM
GND
32
31
30
21
10
μF
VIN
V-
(-5V)
5
3
8
2
4
+5V
35
TC7660
26
+
+
+
–
LED
Drive



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